2006-09-26 18:14:30 · 28 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Ceiling fans have two things which are important: direction of rotation of fan and the blade angle. These two are in combination. These two parameters are basically standardised. But technically you can have fans (special order) with opposite direction of rotation and supplementing it with the blade angle.
2006-09-26 18:23:57 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Most ceiling fans employ single phase induction motors. The direction of rotation of the rotor in an induction motor is determined by its winding and its RPM is determined by the number of poles. By convention all ceiling fans in our country or perhaps the world over, rotate in the clockwise direction. For providing the starting torque of course, a capacitor or condensor is provided. The direction of rotation is related to the curvature of the blades of the fan. As the motor or the fan rotates, air has to be pushed down in the axial direction. These blades are manufactured, may be by different companies, depending on the load on the stamping presses. Hence, conventionally all fans must rotate in one direction only for the sake of standardisation.
Some large size industrial fans require three phases; in that case, by changing the connection of any two phases, the direction of rotation can be changed. But in the case of single phase ceiling fans, even by reversing the connection, that is the phase and the neutral, the direction of rotation can not be changed.
2006-09-27 15:09:17 · answer #2 · answered by innocent 3 · 0⤊ 0⤋
Its the matter that from where you see it, if you see it from top of it you will find it rotating in anti clockwise direction.
And the easiest way to make any fan's rotation in clockwise or anticlockwise direction is :-
Switch off the fan,
bring a stick long enough to reach the fan,
wait till the fan has become stationary,
Rotate the fan either in clockwise or anti clockwise direction using the stick.
I hope you can do it now....
You can swing it also this way..,,
2006-09-26 19:20:45 · answer #3 · answered by Shambhu 2 · 0⤊ 0⤋
Any motor can rotate in either directions, so the attached blades also.
But if look at the the blades, u can see that the plane of the blades are not horizontal. to cut the air and to swipe it outwards the blades are kept at an angle with the hozontal plane.
If u want to rotate the fan in anti-clockwise direction then u need to rearrange the blades such that the angle of cutting the air remains same, to get the air circulation unchanged
2006-09-26 18:51:44 · answer #4 · answered by maran 2 · 0⤊ 0⤋
Almost everyone who was introduced to first course in fluid mechanics ask this question and I guess you are no exception.
The fact is that the direction of rotation of fan has nothing to do either with design of motor or that of mechanics of fluids. It is just because of convention followed like switch when pressed down is ON and when pressed up is OFF.
That's it.
Good that you have asked this question, now I think I've answered for all those who have this question somewhere at the back of their mind :)
2006-09-27 01:40:49 · answer #5 · answered by Anonymous · 0⤊ 0⤋
We live in a world of standardization. Fan parts are made world wide. To lessen confusion and lower costs, there are many items that are standardized. Fans of all kinds, not just ceiling fans are a standard design. Even the fans in hair dryers are standardized.
There might be 8 or 10 different brand names all made in the same factory. They just change the outer covering and the logo.
Some fans - including many ceiling fans are both reversible and have variable speeds as well. some have pull chains and some have remote controls.
;-D Fans should be cleaned now and then. they will work more efficiently and look better too!
2006-09-26 19:01:44 · answer #6 · answered by China Jon 6 · 0⤊ 0⤋
basically clockwise direction is choosen as convention and convenience.it depends upon the direction of rotation of the motor. motor is run by the coil windings which depends upon the current supplied by the electricity source . current in the circuit is flown in such a way that the armature will run clockwise .but the direction of the current in the conductor can be changed hence can move in anticlockwise direction also.
2006-09-26 18:57:49 · answer #7 · answered by KrishanRam(Jitendra k) 3 · 0⤊ 0⤋
Flip the switch on the side of your ceiling fan. They are set up with two directions. Since hot air rises, one direction pulls cold air up and forces the warm air down along the walls, good to use in the winter time. The direction most often used pushes air downwards and pulls air up the walls, keeping a constant flow of air on the "spectator."
2006-09-26 18:19:02 · answer #8 · answered by escobacabeza 1 · 0⤊ 0⤋
There's a little black switch on the base of the fan, it will turn it counter clockwise. The reason it has this is heat rises(it's light weight), cold goes downward(it's heavy). This way you can keep either(cool or warm) circulating in your home in winter or summer by the way your vents are positioned in the floors, walls, or ceilings.
2006-09-26 18:35:44 · answer #9 · answered by Liome 3 · 0⤊ 0⤋
I read the question many times.......I don't find any ceiling fan rotating clockwise........
It's rotating Anti-clock wise only.....
If the direction changed to clockwise then air will goto ceiling only....that's why.....
You can find clockwise rotation in fresh air fans...........
Now you understand the concept.........
Good question indeed..
Have cool breeze in ceiling fan.....
2006-09-26 18:42:56 · answer #10 · answered by Mylapore Mani 3 · 0⤊ 0⤋